Diesel engines used to be known for producing cloud of thick, black smoke, but that has changed greatly over the years. Many modern diesel engines, in fact, do an excellent job of minimizing the particulate-laden emissions that used to make their predecessors so environmentally unfriendly and unpleasant to be around. Progress Made on One Front Opened Up Diesel Exhaust Troubles of Another Kind Despite that fact, some diesel engines are still capable of producing large amounts of another potentially harmful substance. When the fuel to air ratio of a diesel engine is made leaner in order to cut down on carbon-heavy waste, nitrogen oxide emissions tend to rise in direct proportion to the magnitude of the adjustment. However, nitrogen oxides are among the prime culprits in the formation of smog, a localized environmental problem that can render entire cities dangerous to inhabit and work in. One proven means of reducing the amount of nitrogen oxide a given engine produces is to injec
BlueDEF
At commercial fuel stations, truck drivers can add the fluid if the container is low. DEF is typically available at fuel retailers that sell diesel fuel.